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Add acknowledgments

ACKNOWLEDGMENTS.md

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+# Acknowledgments
+
+The Internet Yellow Pages could not exist without all the awesome prior research and
+data sources. We list all of them here, if possible with their corresponding licenses,
+to which you will need to conform if you use the public instance or create a dump that
+includes these data sources.
+
+Please refer to the READMEs in the respective crawler directories for more information.
+
+## Alice-LG
+
+We retrieve route server looking glass snapshots from the following IXPs.
+
+|   Name   |            URL             |
+|----------|----------------------------|
+| AMS-IX   | https://lg.ams-ix.net/     |
+| BCIX     | https://lg.bcix.de/        |
+| DE-CIX   | https://lg.de-cix.net/     |
+| IX.br    | https://lg.ix.br/          |
+| LINX     | https://alice-rs.linx.net/ |
+| Megaport | https://lg.megaport.com/   |
+| Netnod   | https://lg.netnod.se/      |
+
+## APNIC
+
+We use [APNIC](https://labs.apnic.net/)'s [AS population
+estimate](https://labs.apnic.net/index.php/2014/10/02/how-big-is-that-network/).
+
+## BGPKIT
+
+We use the as2rel, peer-stats, and pfx2as [datasets](https://data.bgpkit.com/) from
+[BGPKIT](https://bgpkit.com/).
+
+Use of this data is authorized under their [Acceptable Use
+Agreement](https://bgpkit.com/aua).
+
+## BGP.Tools
+
+We use [AS names, AS tags](https://bgp.tools/kb/api), and [anycast prefix
+tags](https://github.com/bgptools/anycast-prefixes) provided by
+[BGP.Tools](https://bgp.tools/).
+
+## CAIDA
+
+We use two datasets from [CAIDA](https://www.caida.org/) which use is authorized
+under their [Acceptable Use Agreement](https://www.caida.org/about/legal/aua/).
+
+> CAIDA AS Rank https://doi.org/10.21986/CAIDA.DATA.AS-RANK.
+
+and
+
+> The CAIDA UCSD IXPs Dataset,
+> https://www.caida.org/catalog/datasets/ixps
+
+## Cisco
+
+We use the [Cisco Umbrella Popularity
+List](https://s3-us-west-1.amazonaws.com/umbrella-static/index.html).
+
+## Citizen Lab
+
+We use URL testing lists from [The Citizen Lab](https://citizenlab.ca/).
+
+> Citizen Lab and Others. 2014. URL Testing Lists Intended for Discovering Website
+> Censorship. https://github.com/citizenlab/test-lists.
+
+This data is licensed under [CC BY-NC-SA
+4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/). No changes were made to the data.
+
+## Cloudflare
+
+We use the `radar/dns/top/ases`, `radar/dns/top/locations`, `radar/ranking/top`, and
+`radar/datasets` endpoints of the [Clouflare Radar](https://radar.cloudflare.com/) API.
+
+This data is licensed under [CC BY-NC
+4.0](https://creativecommons.org/licenses/by-nc/4.0/). No changes were made to the data.
+
+## Emile Aben
+
+We use [AS names](https://github.com/emileaben/asnames) provided by Emile Aben and
+others with permission (Hi Emile!).
+
+## Internet Health Report
+
+We use three datasets from the [Internet Health Report](https://ihr.iijlab.net/) (that's
+us!): Country Dependency, AS Hegemony, and Route Origin Validation.
+
+This data is licensed under [CC BY-NC-SA
+4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/). No changes were made to the
+data.
+
+## Internet Intelligence Lab
+
+We use the AS to organization mapping from the [Internet Intelligence Lab at Georgia
+Tech](https://inetintel.notion.site/Internet-Intelligence-Research-Lab-d186184563d345bab51901129d812ed6).
+
+> Z. Chen, Z. Bischof, C. Testart, A. Dainotti, "AS to Organization Mapping",
+> Internet Intelligence Lab at Georgia Tech,
+> https://github.com/InetIntel/Dataset-AS-to-Organization-Mapping
+
+Use of this data is authorized under their [Acceptable Use
+Agreement](https://raw.githubusercontent.com/InetIntel/Dataset-AS-to-Organization-Mapping/master/LICENSE).
+
+## Number Resource Organization
+
+We use the [extended allocation and assignment
+reports](https://www.nro.net/about/rirs/statistics/) provided by the [Number Resource
+Organization](https://www.nro.net/).
+
+## OpenINTEL
+
+We use several datasets from [OpenINTEL](https://www.openintel.nl/), a joint project of
+the University of Twente, SURF, SIDN Labs and NLnet Labs.
+
+The `tranco1m` and `umbrella1m` [datasets](https://data.openintel.nl/data/) are licensed
+under [CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/). No changes
+were made to the data. In addition, there are [Terms of
+Use](https://data.openintel.nl/data/README.txt) for this data.
+
+The [DNS Dependency Graph tool](https://dnsgraph.dacs.utwente.nl/) is a joint project of
+the University of Twente and IIJ Research Laboratory.
+
+Other datasets are used with permission from OpenINTEL.
+
+## Packet Clearing House
+
+We use the [daily routing snapshots](https://www.pch.net/resources/Routing_Data/) from
+[Packet Clearing House](https://www.pch.net/).
+
+This data is licensed under [CC BY-NC-SA
+3.0](https://creativecommons.org/licenses/by-nc-sa/3.0/). No changes were made to the
+data.
+
+## PeeringDB
+
+We use the `fac`, `ix`, `ixlan`, `netfac`, and `org` endpoints of the
+[PeeringDB](https://www.peeringdb.com/) API.
+
+Use of this data is authorized under their [Acceptable Use
+Policy](https://www.peeringdb.com/aup).
+
+## RIPE NCC
+
+We use AS names, Atlas measurement information, and RPKI data from the [RIPE
+NCC](https://www.ripe.net/) and [RIPE Atlas](https://atlas.ripe.net/).
+
+## Stanford
+
+We use the [Stanford ASdb dataset](https://asdb.stanford.edu/) provided by the [Stanford
+Empirical Security Research Group](https://esrg.stanford.edu/).
+
+> [ASdb: A System for Classifying Owners of Autonomous
+> Systems](https://zakird.com/papers/asdb.pdf).
+> Maya Ziv, Liz Izhikevich, Kimberly Ruth, Katherine Izhikevich, and Zakir Durumeric.
+> ACM Internet Measurement Conference (IMC), November 2021.
+
+## Tranco
+
+We use the [Tranco list](https://tranco-list.eu/) provided by the [DistriNet Research
+Unit KU Leuven](https://distrinet.cs.kuleuven.be/), [TU Delft](https://www.tudelft.nl/),
+and [LIG](https://www.liglab.fr/).
+
+The Tranco list combines lists from five providers:
+
+1. [Cisco
+Umbrella](https://umbrella-static.s3-us-west-1.amazonaws.com/index.html)
+1. [Majestic](https://majestic.com/reports/majestic-million) (available under a [CC BY
+   3.0](https://creativecommons.org/licenses/by/3.0/) license)
+1. [Farsight](https://www.domaintools.com/resources/blog/mirror-mirror-on-the-wall-whos-the-fairest-website-of-them-all)
+1. [Chrome User Experience Report (CrUX)](https://developer.chrome.com/docs/crux/)
+   ([available](https://research.google/resources/datasets/chrome-user-experience-report/)
+   under a [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/) license)
+1. [Cloudflare Radar](https://radar.cloudflare.com/domains)
+   ([available](https://radar.cloudflare.com/about) under a [CC BY-NC
+   4.0](https://creativecommons.org/licenses/by-nc/4.0/) license).
+
+## Virginia Tech
+
+We use the [RoVista](https://rovista.netsecurelab.org/) dataset provided by the
+NetSecLab group at Virginia Tech.
+
+> RoVista: Measuring and Understanding the Route Origin Validation (ROV) in RPKI.
+> Weitong Li, Zhexiao Lin, Md. Ishtiaq Ashiq, Emile Aben, Romain Fontugne,
+> Amreesh Phokeer, and Taejoong Chung.
+> ACM Internet Measurement Conference (IMC), October 2023.